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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82887b49f9bb2b42a5a9283804ab3a0fc63dd0e51df869f0226f438e492a7f9' 
  AND token = '/nmaIv1bLZTUyjdrJ9Skw/64OXXAoD3Y6o8IxrBXxfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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