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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89a49b36663cb22246084a90c9a6f90b7528ce18d9007ca1475da3e780db2f0' 
  AND token = 'qkiJP/Np5iTGFvPp0nLEi66hvsQUrNFYuYpyTc8wbj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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