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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a3ad4a2c57d13f69ef88b3ea62767f29e3d720cbccab276a4c7e24d1ae4de9' 
  AND token = 'eHTuRh/q4Yc4jF4Lb0zLxcDcJoJrtnXXgNXb2AopxEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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