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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b62bb77b0cf23d19c065e7c84a70043f1f76b7947998980212faf42075c9f5a' 
  AND token = 'P2ET976maIO3jr2HvxVxy0rp9Dg1UY4NbiLR7nbwvG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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