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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a8ac08a9628639626e095bd830e4125c22bc8ec1a1f2bbc9e297f071c2f48eb' 
  AND token = '4t8zrmD9YD7HquapaIyUgxPuuGjgqa2ODzRNthXAcGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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