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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a0f76e6a5f11ab7abdd80ead10fbcbf7ef0ac3909a89e00bd72222db78669a' 
  AND token = 'R4Jx894I6Jmy9cWvNor24AHVq27IrgrLdpzYVYmHo0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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