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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c2c3391991f47557189eb9016bc390964b227c5035422f460418d2d14386e9' 
  AND token = '4hfxCJFpnW5eOh9HLE9el90msXUDGJpt/OLkyRwpcow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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