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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f1643726445e1158cb3ed9d0bb82e23ccd34def315722ad533a470bf65fff3' 
  AND token = 'nTVPZbhGEzhNphhRzeR5n9zWI5qPJ+uYFNyfq7FPxGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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