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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a305228bd45dfc29197f6633c66d74e01ecce7ae4327618ddff1274afeaab869' 
  AND token = '0UdgVJPEAMwmny+dAxoab16a+roDwK+vXdqe9s/lt2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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