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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d7f79937f367269c06c7333530a2e728edd34b271c3e25b29e9916d3d322d87' 
  AND token = '3J5hFZzLsjaM+h9zcpFj76fllqPLVtyDuOGcK/Ae/RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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