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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7bd05594682b4306760737125a550ea55e8d2ea656fafbfb0836f2186a11f5' 
  AND token = 'z6zOgymvm7XVBNCzDBQ31A6QZck+hqwi4tuvOHDSfaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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