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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27ee877d3019f05917692a859a331e0a92a42d52d69919f35e3f25c01a2a1bcb' 
  AND token = 'c4nplCOBRdv9NH8wLL6fBAfxVH8HPH6xYm2FXHHACKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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