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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae32c06a3ed261f5d6823d9ff42985e8c9ea63b9289cf64cc4db54f82315a97' 
  AND token = '7FUfVBu0UcgjVC83RK23uXIvf88kqNlT1U1D3RyOj4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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