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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '346aeb813928ac603a890b7cc8d36b481215797113595be905a54654e01a010e' 
  AND token = 'R9G1gHgO+eQ2p67S/6YkNeJ4jl+FGKCNGqGbqe7UC58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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