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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac47efaf52f431e295b563d9aead55a5e9ce74c7105144ea7f32b57e5880e4b' 
  AND token = 'HeVfr2LT4k3E9gQ+PsCbzr3Sjp9Eca3y+wz2aNOurd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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