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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03bbd17dfd9a09c2ed446a36c73cde9a4c1256f4934da5243cde0c6bf59d3db5' 
  AND token = 'MHuF0h2LKI6d4tkWzXiRMUKNE5KzmPuSM1YYa7p2oFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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