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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b756b274ba7d8a550e174396bd8b1b171b5ff27e4d61c8a46ce32b48b09974' 
  AND token = 'zHe0AwcF1YpPNt5thGxMGBc/9Regms6HMD63GHxZYkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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