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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f73a3ee619e14ef6433b031cde43b8e3376065ea939035a27ac6c62fc9ee089' 
  AND token = 'B0cU9Vi4SqIXHw/BfCElKZvaD0FEcich0LbMh69thGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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