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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04753a5aae14f5c38e85f4191983fd4727158829be79579c477360cc1c3c16ca' 
  AND token = '9+HGdYxUwAMIb4KdNsQf7Cik4yn2xYU8nhBfYhusKiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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