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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd8b6ba16c30af128658d64d5e89ffe1efe859c7f0770260df9d00c3b3f3d5ed' 
  AND token = '3PAHCihbDB/dOA5Jf11raG2D32Ni5YWpsLiLa7XuPTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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