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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f90c7ba64c0a3c6e7ede890ecce072e2ba190cd1906ed7564f9b9b5508d3dc8' 
  AND token = 'cVRKZac5H/LeFpQ/YYdCpzmkmoaCjN1ByLQ9jl1ziTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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