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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56dce3271e244711b433d2543ed0dd546c65fd5229171714d143fa0120e7c323' 
  AND token = 'CqY71wosPqPNvP0pjQyQHH+Vc0DkRZAfyThWTCS47Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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