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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cd79367af9fc1d7375fe592074926d4e758693fbdc255c9ba1214903fb2a184' 
  AND token = 'cU2YEl/Fbe14gRq7sFeaYNAkd7yzLPNkIQd61T3Po+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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