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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a319104927b60a111de4202dbcbbc9610c2e9e968a94dbb191656b1640de6e92' 
  AND token = 'N3+y3vSgGgyuKbtrSjZu9WZ7RtY+IZduoObIsPo+PZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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