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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '992fce6126ad992dfe6f3b848803852c5d6a1ddaffc3f2716eadb4302a2f15dd' 
  AND token = 'W/d7Ao9I24IzIn0qhjxtSSqQuZqJmYfqJhHjC79bxfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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