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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fe8ac2f5eddf226251d423de4704d0a6ea9e4d8063fe20706fa81e63f4a309d' 
  AND token = 'Rn1SMnkHGNitBObTQdySXumman4Ux2paTkL0A5ERSZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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