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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b53bcd270597f4faad945ceaa3931187223d1e4748ee879599d5a043358e92ca' 
  AND token = 'SFtWJ9Q4elCX5WZ8nwP/w+hU3sZFdLi+r6q24sfe8ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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