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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d42332732aa7b5c3797e8a6440fb4529c7bdae497011f0efb0d3eebffa8d3a' 
  AND token = 'S7WjLnDvvPkV+N1qNSuFnp44OOrBIu/ebZWp7ZzH7Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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