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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f976c6f5c1a25c0d4449ce274bd4e2c32612ed01068169ec793db455f6d11324' 
  AND token = 'F/nkstCLkNyAf057nenRycf643LZ58DFeOvT8R0VTkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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