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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10ff1d01142c431789fcd1cc58b1c6fa135ee1422c6be83ee4c60c2671ecaee5' 
  AND token = 'CcF4217qXhswPnucarZ4IoIrhDSTifOzkJ/tD/yxYvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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