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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2185fc5c39da561a1907f1002553514754fc90c9750cfc273a64b37fbd8a2d5f' 
  AND token = 'gzj93I+H45aPzafkZ7fJbjkx0/uNgRJzfccwgWXy59U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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