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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0341945499b1578ca2422a4a8a1c4900d54781e7f2ce11759cee239226a2ea75' 
  AND token = 'ogQAsF9Kc9FHCOHMQ3NDh1Tfh0dbmopcU0Ob+qv9jms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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