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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94decbd9167410214a7bc036e7232c15cfa8a0cc87787c14416eb79bad077048' 
  AND token = 'WI2yOF4qSl5g+6cfMn8/GfZQLTJlM2E9DrIcdvZ1Y4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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