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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c9ba1a166211277f3f3a0ddd5f72ed2282668a006b8f35856b6e4171215ccbe' 
  AND token = '8a3rCQAL3oeMHGId5R37rnZcCAAcQx9J64PB0qKxo0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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