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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4830450cbb676e00ceeb479d5622941ed2b77b62f2e25a1dc085474387fab157' 
  AND token = '1rvLe6fD4GwXcTvowC/jlLbSaJ3AD0Ps3at7xfCLmOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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