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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c47a87bb74b7b506d74da175a4530fd0062be01f072a20486431a0b955b5dac' 
  AND token = 'xJeHVxzPUU7lWputoiHeYu2Rz5upIN90iT3R9tidpW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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