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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e729527ab3df1e1f8522b2329ca9c8ba86be4e3a9283c46de90cba49a92a53' 
  AND token = 'EXqUSbjiwKTm5nxEjycmfL3EO2mZjtH5lq8WS305jvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}