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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096d57bb681c1b6f715fd5404445f3f4ff84d850362779a7f7a0be9c9133c889' 
  AND token = 'g4h2+ax7S2kAXZIl3+N/j5RKU907I+YCEcZCIz9csCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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