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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47a1ac621a2b6fabce87df7e4be836cc4082f65cc3ffa7eb56f9ad33302e970' 
  AND token = 'X3JTcilL3aubE9ekpA9teezvK/lkOgoGUXZ6Dm7SQTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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