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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaba0e5ad6900f846badf48a2cdc95648d850fd07279da07a9bfe05c14234089' 
  AND token = 'aa2a/AnorATCIVDuteHx7NRrCNVfMyl77Yi8mLhAI1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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