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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14025a8dc4b19eb272674387c53353e91fb83908f4cbbc1779074712fdfd4a3b' 
  AND token = '/iGEdFklgZ86FW6/U77Y1QwUYOD1ITzcEq/peT7GB2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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