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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9f080ccfe775118a452a162965e2dd332e72a7b0920de209ba8798d2429ba17' 
  AND token = '2ruEa6hXvyyP6DaqBQDmrDAVlBd0xCG280kJYIcc8Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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