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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea9892184333acdf9c748fc74c55df765d227dd574fc4d2ad96ef2870244767' 
  AND token = '+nIl9+Imiy/3ryOETST6lcD5Q+2R3r7m1y9OurausJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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