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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee1516ca0ccbef91a7f064bb6a1cc671ce9d2857d726111bb1d90216d7425a2' 
  AND token = 'dI4Q10AJksC0BsBAOpGa8+rip9t1q7SpxS6BCCvbvc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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