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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed83be9f8b1c6e47291f30f1b0a60ba8d764fbc0bde44af3b9df9f93a9c9a0d8' 
  AND token = 'XeHI+m6zCctDqrHyQ2BfYlRDum1q+qTi4VL5U2bwLDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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