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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07a0ffaaf042d200b5752923381658bbe6555fb2c794633a5733861c98d1cd4' 
  AND token = '9cGboDzH6VZ35yAZjErj+u3iniAMcXM2ci2/pnNI1BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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