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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df5f9fbd7cd6169a4d4c9ea87d0502b8cebbf7f8a3ca0e987d3126c6d758923' 
  AND token = 'AH+p90zXxNNk2ZCMknhZ3eCM1rLRSEVpgyQ+hNFQmxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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