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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3360e1ca9859530fdb745524d2b5f5e345c1a2cb9cc17f7840e58aacdd9c4546' 
  AND token = 'fPW0YBR+rjJdkyDL826Zg3n1+vPOS7/2e01u61xN9Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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