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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b93e9a71e3ac8c9a6ab5dfd00c66850e4ad6bcacaddad1b13159d8aeb0676bd' 
  AND token = 'c8j3Hgf6AFgRWbXOV2EVSBo3YK3YypW+1A1advbJaJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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