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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd945ad8a514328226441c4135e7271773bbc696782a0f2cb1747d35a16b2afd' 
  AND token = 'RsyZQwlbwn+8DriwkeLEr8d2pd/BO+/m9k6+6mYRLLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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