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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53f5905c0ef3e9697e2633d0086fce9537dc1ea73519f81887bb30faaf7c7b4d' 
  AND token = '4gN604Yre72bfcx4hDh4djKun8e9gC0MhLHjpjusx5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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