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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be1db83c8ad4dc58edb5c1cb6b658239e9bf210a1bd06d61fa019eed3085129' 
  AND token = 'gHVAIcuC0QsyzVKasnYE4O80Yw9V35vOMHnv8Ys/CHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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