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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '108c46316cbebd8316f7df08af85da48724b66c9a2c280e6d0474c9a78d368a0' 
  AND token = '5D2CbtGOZdsaAhUBr7fPcx9aX26hS7m0c83/hETdTig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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