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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80851136f9ebd7c7634a94fff2ebfb910cd2bfa7c9cacf282ff03767396b6cc3' 
  AND token = 'FooK46Do/x/sBhbKoRZsfxqWARVP2I1Oqte7DU0+h7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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