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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf3fb71761041d4004e9d4ace802646f6b48702a3c8843dc475cfe672518907' 
  AND token = 'fRcJLWhHKTSCurEN2bX+mKG2qov76F0l+xxsJ0pWk0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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