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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92bd2afe730d2e3f0ed635901bf83f38ebc9e0e54a6100fae8e6ed87b8763dcb' 
  AND token = 'DkrSy7wyC5l7NKEoPQuO60PQq3Feanw3b2Tdtjkod2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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