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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eecaa8ac3c6f63e24bfbc9bdfab1a382d3572d9478d1f8424de3a8f7f988e8b2' 
  AND token = 'Xgppi/SjWUj0cLZiLyCgSNDPSAFpG6I3Ti8wX7cdqqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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