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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25dc6f56fbb9e9aae72183fac4a6611c8fdbb4c1725e5c36405a41cad1b2aced' 
  AND token = '/O0f74yp2FHtM79945KIOylP6JXnDmFEhaGhJDkhT/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00112

JSON explain

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