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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313fc602e4f5ed9b1612786ab40c16c1c560dd634053ad3606e3deb6d0993f77' 
  AND token = 'soLq9rNi+ztP7JhEdF2G31OIAsNwQOX00YZoCHqRA94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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