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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee0fb89a798b4c355a064aa7e11e35a7671228e763763bbbe2b250756482555' 
  AND token = 'fBSSWspVZyKMmW7jE+uCv5QVgtE8Dz3AKUXgmRx21t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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