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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8858f5b925fead927e2bbab800194e3865e2060abfe0e5cfaaab8b8827b012' 
  AND token = 'mOpnHUT+GXffGdXc70wO3d1NIakoPn9By2Rft0hw7KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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