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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84cb80abd75dede59b5081a8c3320c5b14ece599a4a7bdd94b1e4d593042c94c' 
  AND token = 'pyy+QHv64lIfRTCF1QdzCV73dQjD4FVsLN5ELgS4uYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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