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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cd31ac69c89eba785c6cf7cf0aa0aad4edbb168c202f5d9ef436f337b20d1e6' 
  AND token = 'I0xfTixmR3CGe7iinzdKon2Jr7DUpT++fq5/iuGEKCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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