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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41c2a1988da63f865af2e62088ab9d326a2b867b8865669ef238d7469866716' 
  AND token = 'iekhdMZ566KfZvMR4l7h/F1JEb85vrOpVIKI4est5Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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