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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd99f2659e9a0bf5eede3a542444bfb11443d1b2541e8ae8c1de13a6f51a62ac' 
  AND token = 'ogOe4w7EWTZzAtV7YvYNxyJ111vnSi0qazRWsF6SPQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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